Block size

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blockdev --getbsz /dev/sda11
4096
blockdev --getsize64 '/dev/sda'

tune2fs -l /path/to/device | grep "Block size"

Windows: fsutil fsinfo ntfsinfo [your drive]

fsutil fsinfo ntfsinfo C:
NTFS Volume Serial Number :        0x3a32d3ff32d3de55 
NTFS Version   :                   3.1
LFS Version    :                   1.1
Number Sectors :                   0x000000004af04fff
Total Clusters :                   0x00000000095e09ff
Free Clusters  :                   0x0000000008e1334d
Total Reserved :                   0x0000000000001824
Bytes Per Sector  :                512
Bytes Per Physical Sector :        512
Bytes Per Cluster :                4096
Bytes Per FileRecord Segment    :  1024
Clusters Per FileRecord Segment :  0
Mft Valid Data Length :            0x000000000d8c0000
Mft Start Lcn  :                   0x00000000000c0000
Mft2 Start Lcn :                   0x0000000000000002
Mft Zone Start :                   0x0000000000506840
Mft Zone End   :                   0x0000000000513060
Max Device Trim Extent Count :     0
Max Device Trim Byte Count :       0x0
Max Volume Trim Extent Count :     62
Max Volume Trim Byte Count :       0x40000000
Resource Manager Identifier :     9D21DA68-6D41-11EA-8D5C-B54A0A7FDTXT

Bytes Per Cluster is the equivalent of the allocation unit.

See also

• file, File system, directory, touch, mkdir, ls, ln truncate, fallocate, split, stat, inode, File descriptor, superblock, block size (blockdev), fuser, lsof, scrub, chattr, ulimit (nofiles), cp, mv, file (command), mkfifo, chmod
• File systems: clustered file system, tune2fs mkfs.ext4,superblock, e2fsck, resize2fs, mount, df, umount, UUID, fstab
• Block devices: HDD, SSD, Intel Optane, block size